Stone-cutter&#39;s chisel.



PATENTED MAY 29, 1906.

J. W. FOX.

STONE CUTTBRS CHISEL.

APPLICATION FILED MAE.1, 1906.

avwzntoz (Ja /7o W1 0X UNITED STATES PATENT oFFIoE.

JOHN W. FOX, OF EAST HUNTINGDON TOWNSHIP, WESTMORELAND COUNTY,PENNSYLVANIA.

STONE-CUTTERS CHISEL.

To aZZ whom it may concern- Be it known that I, JOHN W. Fox, a citizenof the United States, residing in East Huntingdon township, in thecounty of Westmoreland and State of Pennsylvania, have invented new anduseful Im rovements in Stone-Cutters Chisels, of which the following isa specification.

This invention relates to improvements i stonecutters chisels.

The object of the invention is to provide a detachable bit or blade withpeculiar and specific means for holding it in its handle.

In the drawings, Figure 1 is a vertical section of my improved chisel onthe line 1 1, Fig. 2. Fig. 2 is a transverse section on the line 2 2,Fig. 1. Fig. 3 is a horizontal section on the line 3 3, Fig. 2. Fig. 4is a side elevation of a slight modification. Fig. 5 is a cross-sectionof the same on the line 4 4., Fig. 4.

1 indicates a handle, chuck, or the like which is slightly flattened andbeveled at its lower end 2 from the edge 3 to a point 4.. Said beveledend is split, as shown at 5, to receive the bit 6 and forming two legs 22. A transverse slot 7 is formed in the beveled end 2 to receive thesquared portion 8 of a clamp 9.

Clamp 9 is of peculiar formation and forms a most essential part of myinvention. The head 10 of the clamp is disposed at an angle to thecenter of the square portion 8 to fit squarely the beveled face of oneof the legs 2*. This peculiar relationship between the body of the clampand the head positions the threaded end 11 at right angle to the beveledface of the opposite leg 2*, as clearly shown in Fig. 1.

The bit 6 is oblong in outline and is adapted to be fitted in the splitend of the handle and is provided with a square opening 13, throughwhich the squared portion of the clamp passes. However, this exact shapeof the opening is not necessary; but one wall thereof must be straightto prevent the clamp turning.

To assemble the parts of the chisel, the bit 6 is placed in the splitend 2 of the handle, its edge 12 projecting beyond said handlesufiiciently to form a cutting edge. Then the body of the clamp ispassed through the slot 7 and the square opening 13, head 9 fittingsquarely against the beveled surface of leg 2 and the free threaded end11 inclining downwardly Specification of Letters Patent Applicationfiled March 1, 1906. Serial No. 303,6 99.

Patented May 29, 1906.-

at right angle to the opposite beveled surface of leg 2 where abinding-nut 13 is applied to clamp the two legs tight against the bit.It will be noted that when the parts are assembled the head of the clampand the nut form a beveled way corresponding to the beveled end ofhandle 2. The object of this relationship of parts is essential to thepractical operation of my invention, in that as ablow is imparted to thechisel the tendency is to drive the bit and the handle toward eachother, resulting in forming a more substantial binding action of theclamp on the beveled surfaces of the handle, consequently insuring ofthe holding of the bit in lace.

p The opening in the bit and the slot 5 corresponding to the shape ofthe body of the clamp, the bit cannot turn, which is necessary in a toolof this character.

Obviously the bit may be made thin enough that it may sharpen itselfWhile being operated.that is to say, as one side wears down the oppositeedge is sharpened, and by turning over the tool the other side may besimultaneously treated.

In Figs. 4 and 5 I have shown my improvement used in connection with anetchingtool 20. These tools are usually very thin and cannot withstandan unusual blow without being deflected laterally. To meet thisrequirement, the inner edges of the legs 21 are formed with flanges 22,which embrace the edges of the tool and hold it against lateralmovement. The upper end of the tool is made wider than the lower end tostrengthen it and is secured to the handle in exactly the same manner asheretofore described.

What I claim is 1. A chisel, comprising a handle which is beveled andsplit at its end and formed with a slot, a bit fitted in the split end,said bit having an opening a threaded clamp having a stem which passesthrough the slot in the handle and the opening in the bit and having ahead at an angle, the angle of the head corresponding to the adjacentbeveled side of the handle, and a nut engaging the threaded end of theclamp and bearing on the opposite beveled side of the handle, to clampthe bit in the split end of said handle,whereby when a blow is impartedto the chisel the bit will be more rigidly held to the handle.

2. A chisel, comprising a handle which is beveled and split at its endand formed with a slot, a bit fittedin the split end, said bit having anopening, clamping means passing through the slot in the handle and theopen ing in the bit and including means fitting the beveled sides of thehandle, whereby when a blow is imparted to the chisel the bit will bemore rigidly held to the handle.

3. A chisel, comprising a beveled handle which is split at its end andformed with a slot, a bit fitting in the split end and formed with asquare opening, a clamp having a square portion and a head at an angleto said square portion, said head impinging one beveled side of thehandle and the square portion passing through the slot and the squareopening in the bit, and anut screwed on the clamp and impinging theopposite beveled surface of the handle, a blow on the chisel causing thebolt to clamp the bit and handle together.

4. A chisel, comprising a beveled handle split at one end and formedwith a slot, a bit having an opening with one wall straight, a clamphaving a flat surface extending through the slot in the handle and theopening in the bit on a line at a right angle to one of the beveledsurfaces of the handle and including a head to engage one beveledsurface, and adjusting means which fits against the opposite beveledsurface of the handle to bind the bit in the split end, the fiat surfaceof the clamp cooperating with the straight wall of the opening in thebit to prevent said clamp turning.

5. A chisel comprising a handle which is beveled and split at its endand formed with a slot, flanges formed at theedges of the split toembrace a bit, a bit fitted in the split end of the handle and formedwith a clamp-receiving opening, a clamp passing through the slot in thehandle and the opening in the bit and engaging the opposite sides of thebeveled handle.

In testimony whereof I aflix my signature in presence of two subscribingwitnesses.

, JOHN W. FOX.

.Witnesses (l. E. HELLER, DAVID L. NEWILL.

